/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.transformation.dag.column.unary;

import org.apache.iotdb.db.exception.sql.SemanticException;
import org.apache.iotdb.db.mpp.transformation.dag.column.ColumnTransformer;
import org.apache.iotdb.tsfile.read.common.block.column.Column;
import org.apache.iotdb.tsfile.read.common.block.column.ColumnBuilder;
import org.apache.iotdb.tsfile.read.common.type.Type;
import org.apache.iotdb.tsfile.read.common.type.TypeEnum;

import java.util.HashSet;
import java.util.Set;

public class InColumnTransformer extends UnaryColumnTransformer {
    private final Satisfy satisfy;

    private final TypeEnum childType;

    private Set<Integer> intSet;
    private Set<Long> longSet;
    private Set<Float> floatSet;
    private Set<Double> doubleSet;
    private Set<Boolean> booleanSet;
    private Set<String> stringSet;

    public InColumnTransformer(
            Type returnType,
            ColumnTransformer childColumnTransformer,
            boolean isNotIn,
            Set<String> values) {
        super(returnType, childColumnTransformer);
        satisfy = isNotIn ? new NotInSatisfy() : new InSatisfy();
        this.childType =
                childColumnTransformer.getType() == null
                        ? null
                        : childColumnTransformer.getType().getTypeEnum();
        initTypedSet(values);
    }

    @Override
    protected void doTransform(Column column, ColumnBuilder columnBuilder) {
        for (int i = 0, n = column.getPositionCount(); i < n; i++) {
            if (!column.isNull(i)) {
                switch (childType) {
                    case INT32:
                        returnType.writeBoolean(columnBuilder, satisfy.of(column.getInt(i)));
                        break;
                    case INT64:
                        returnType.writeBoolean(columnBuilder, satisfy.of(column.getLong(i)));
                        break;
                    case FLOAT:
                        returnType.writeBoolean(columnBuilder, satisfy.of(column.getFloat(i)));
                        break;
                    case DOUBLE:
                        returnType.writeBoolean(columnBuilder, satisfy.of(column.getDouble(i)));
                        break;
                    case BOOLEAN:
                        returnType.writeBoolean(columnBuilder, satisfy.of(column.getBoolean(i)));
                        break;
                    case BINARY:
                        returnType.writeBoolean(
                                columnBuilder, satisfy.of(column.getBinary(i).getStringValue()));
                        break;
                    default:
                        throw new UnsupportedOperationException("unsupported data type: " + childType);
                }
            } else {
                columnBuilder.appendNull();
            }
        }
    }

    private void initTypedSet(Set<String> values) {
        if (childType == null) {
            return;
        }
        switch (childType) {
            case INT32:
                intSet = new HashSet<>();
                for (String value : values) {
                    try {
                        intSet.add(Integer.valueOf(value));
                    } catch (IllegalArgumentException e) {
                        throw new SemanticException(
                                String.format("\"%s\" cannot be cast to [%s]", value, childType));
                    }
                }
                break;
            case INT64:
                longSet = new HashSet<>();
                for (String value : values) {
                    try {
                        longSet.add(Long.valueOf(value));
                    } catch (IllegalArgumentException e) {
                        throw new SemanticException(
                                String.format("\"%s\" cannot be cast to [%s]", value, childType));
                    }
                }
                break;
            case FLOAT:
                floatSet = new HashSet<>();
                for (String value : values) {
                    try {
                        floatSet.add(Float.valueOf(value));
                    } catch (IllegalArgumentException e) {
                        throw new SemanticException(
                                String.format("\"%s\" cannot be cast to [%s]", value, childType));
                    }
                }
                break;
            case DOUBLE:
                doubleSet = new HashSet<>();
                for (String value : values) {
                    try {
                        doubleSet.add(Double.valueOf(value));
                    } catch (IllegalArgumentException e) {
                        throw new SemanticException(
                                String.format("\"%s\" cannot be cast to [%s]", value, childType));
                    }
                }
                break;
            case BOOLEAN:
                booleanSet = new HashSet<>();
                for (String value : values) {
                    booleanSet.add(strictCastToBool(value));
                }
                break;
            case BINARY:
                stringSet = values;
                break;
            default:
                throw new UnsupportedOperationException("unsupported data type: " + childType);
        }
    }

    private boolean strictCastToBool(String s) {
        if ("true".equalsIgnoreCase(s)) {
            return true;
        } else if ("false".equalsIgnoreCase(s)) {
            return false;
        }
        throw new SemanticException(String.format("\"%s\" cannot be cast to [BOOLEAN]", s));
    }

    private interface Satisfy {

        boolean of(int intValue);

        boolean of(long longValue);

        boolean of(float floatValue);

        boolean of(double doubleValue);

        boolean of(boolean booleanValue);

        boolean of(String stringValue);
    }

    private class InSatisfy implements Satisfy {

        @Override
        public boolean of(int intValue) {
            return intSet.contains(intValue);
        }

        @Override
        public boolean of(long longValue) {
            return longSet.contains(longValue);
        }

        @Override
        public boolean of(float floatValue) {
            return floatSet.contains(floatValue);
        }

        @Override
        public boolean of(double doubleValue) {
            return doubleSet.contains(doubleValue);
        }

        @Override
        public boolean of(boolean booleanValue) {
            return booleanSet.contains(booleanValue);
        }

        @Override
        public boolean of(String stringValue) {
            return stringSet.contains(stringValue);
        }
    }

    private class NotInSatisfy implements Satisfy {

        @Override
        public boolean of(int intValue) {
            return !intSet.contains(intValue);
        }

        @Override
        public boolean of(long longValue) {
            return !longSet.contains(longValue);
        }

        @Override
        public boolean of(float floatValue) {
            return !floatSet.contains(floatValue);
        }

        @Override
        public boolean of(double doubleValue) {
            return !doubleSet.contains(doubleValue);
        }

        @Override
        public boolean of(boolean booleanValue) {
            return !booleanSet.contains(booleanValue);
        }

        @Override
        public boolean of(String stringValue) {
            return !stringSet.contains(stringValue);
        }
    }
}
